springcloud-alibaba-oss-服务器签名-we

1 . 阿里云注册开通oss账号,并配置好权限阿里云

2. 项目引入jar包:

  <!--spring-cloud-oss对象云存储-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alicloud-oss</artifactId>
            <version>2.2.0.RELEASE</version>
        </dependency>

3.编写controller发送签名:

package com.poeam.guli.thirdpart.controller;

import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.common.utils.BinaryUtil;
import com.aliyun.oss.model.MatchMode;
import com.aliyun.oss.model.PolicyConditions;
import com.poeam.guli.common.utils.R;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.Map;

@RestController
public class PlocyController {

  @Autowired
  private OSS ossClient;

   @Value("${spring.cloud.alicloud.access-key}")
    private String accessId;
   @Value("${spring.cloud.alicloud.secret-key}")
   private String accessKey;

    @Value("${spring.cloud.alicloud.oss.endpoint}")
    private String endpoint;

    @Value("${spring.cloud.alicloud.oss.bukect}")
    private String bucket;

    @GetMapping("plocy")
    public R getPlocy () {
        String endpoint = "oss-cn-hangzhou.aliyuncs.com"; // 请填写您的 endpoint。
        String host = "https://" + bucket + "." + endpoint; // host的格式为 bucketname.endpoint
        String dir = LocalDate.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd"))+"/"; // 用户上传文件时指定的前缀。
        Map<String, String> respMap = new LinkedHashMap<String, String>();
        try {
            long expireTime = 30;
            long expireEndTime = System.currentTimeMillis() + expireTime * 1000;
            Date expiration = new Date(expireEndTime);
            // PostObject请求最大可支持的文件大小为5 GB，即CONTENT_LENGTH_RANGE为5*1024*1024*1024。
            PolicyConditions policyConds = new PolicyConditions();
            policyConds.addConditionItem(PolicyConditions.COND_CONTENT_LENGTH_RANGE, 0, 1048576000);
            policyConds.addConditionItem(MatchMode.StartWith, PolicyConditions.COND_KEY, dir);

            String postPolicy = ossClient.generatePostPolicy(expiration, policyConds);
            byte[] binaryData = postPolicy.getBytes("utf-8");
            String encodedPolicy = BinaryUtil.toBase64String(binaryData);
            String postSignature = ossClient.calculatePostSignature(postPolicy);


            respMap.put("accessid", accessId);
            respMap.put("policy", encodedPolicy);
            respMap.put("signature", postSignature);
            respMap.put("dir", dir);
            respMap.put("host", host);
            respMap.put("expire", String.valueOf(expireEndTime / 1000));
        } catch (Exception e) {
            // Assert.fail(e.getMessage());
            System.out.println(e.getMessage());
        }
        return R.ok().put("data", respMap);
    }

}

postman测试获取签名结果